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post #1 of 15 Old 12-24-2013, 02:14 AM Thread Starter
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Cold effecting tire pressure sensors

Had an interesting thing happen today. I was running errands in the bitter cold which was around 8 degrees. After a bit I got a warning that I had low tire pressure. Wonderful. All I needed was to get a flat tire in this cold with Christmas Eve tomorrow. So I walked around the car and tried to see if I had a low tire as the warning didn't state which. I couldn't see anything.

By chance I was literally two blocks away from the dealership so I drove over thinking perhaps I had a bad sensor. They were just about to close but it seems it was a slow day so they got right too my car. And the problem? I wasn't really low on air although they topped off my tires. They said the severe cold was causing the air in the tire to contract enough to trigger the sensors which could trigger at even the loss of 2 psi from recommended normal.

Has anyone else in a cold climate had this happen?
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post #2 of 15 Old 12-24-2013, 05:10 AM
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Cold weather brings down pressure. Got to always throw in some pounds in, come winter time


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post #3 of 15 Old 12-24-2013, 05:27 AM
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While parked in the garage at my apartment building at 60 degrees, I pumped mine up to 40psi so when it hits the cold air it's at or around 36psi. It's been cold here, several days at or below zero and this morning it's -13 when I drove to work. I have never seen a low pressure light, even at those temps. If yours keeps giving you a warning, I'd bring it in after the holidays and early in the day (so they don't give you the bums rush) to have it checked. Remember, for every 10 degree change in temp the psi changes 1 pound.

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post #4 of 15 Old 12-24-2013, 06:57 AM
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Spring and fall are the times to constantly check and adjust tire pressure.
As posted above, temperature change affects tire pressure.
Once summer or winter settles in the pressures will stabilize.
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post #5 of 15 Old 12-24-2013, 08:14 AM
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Since the TPMS will signal when pressure is "substantially" lower, I wonder if the pressure was already a bit low, so the pressure reduction due to cold temperatures was the tipping point.

Over the weekend, my tire pressure was about 3 pounds lower than a couple of months ago, but that's not enough cause the TPMS to send an alert since it's still within the normal range.

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post #6 of 15 Old 12-24-2013, 08:26 AM
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It depends how the tpms is set up is when it triggers, I believe it's 10% of the recommended


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post #7 of 15 Old 12-24-2013, 01:14 PM
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Also always try to fill your tires when they are cold. Is easy if you have your own compressor it's more annoying if you have to drive far to a gas station because you have to wait to get a true reading
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post #8 of 15 Old 12-24-2013, 02:44 PM
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Quote:
Originally Posted by Elf911 View Post
Also always try to fill your tires when they are cold. Is easy if you have your own compressor it's more annoying if you have to drive far to a gas station because you have to wait to get a true reading
What I did before I bought a small compressor when I owned a house, and now a 5# storage tank, take the reading before driving when the tires are cold, jot down the numbers and if you have to drive more than a couple of blocks to the station and the tires are warm, add the necessary pounds from the cold numbers.

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post #9 of 15 Old 12-24-2013, 03:43 PM Thread Starter
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I grew up in California so this was all new to me. Never got cold enough for this to be a factor.
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post #10 of 15 Old 12-25-2013, 04:39 AM
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A few weeks ago we had about 5 days below 20 degrees and a few days below zero. I was expecting issues with the TPMS, but neither my car or my wife's car had any issues.
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